Reel lock for passenger restraint having dual locking positions

A reel assembly (20) with dual locking mechanisms for restraining a vehicle occupant by controlling the displacement of a length of webbing (24), the dual locking mechanisms comprising:

• a webbing shaft (28) with a geared end plate (32), the webbing (24) being wound about the webbing shaft (28), the end of the webbing (24) being releasably secured to the occupant by way of a clasp (26), whereby the webbing (24) can be unwound from assembly (20) by rotation of the webbing shaft (28);
• a pair of locking pawls (58) pivotally secured to the geared end plate (32), each locking pawl (58) having pivoted and unpivoted orientations, a calibration spring (62) secured to each locking pawl (58), each of the calibration springs (62) having a bias that functions to urge the pawls (58) into the unpivoted orientation, the bias being overcome when the webbing shaft (28) is rotated at a predetermined rate, whereby the pawls (58) are moved to the pivoted orientation;
• a locking ring (34) having a geared inner periphery and an outer surface with a ramp (36), the locking ring (34) positioned around the geared end plate (32) and being independently rotatable relative thereto, one of the locking pawls (58) engaging the geared inner periphery of the locking ring (34) when the pawls (58) are in the pivoted orientation, whereby rotation of the webbing shaft (28) causes the rotation of the locking ring (34);
• a locking bolt (42) with an elongated cutout (44), the locking bolt (42) positioned adjacent the webbing shaft (28) and having engaged and disengaged positions, a spring (50) biasing the locking bolt (42) into the engaged position, a trigger (38) and a sear (52) operatively coupled to the locking bolt (42), with the sear (52) maintaining the locking bolt (42) in the disengaged position against the bias of the spring (50), the trigger (38) adapted to engage the ramp (36) on the outer surface of the locking ring (34) whereby the sear (52) is displaced so as to permit the locking bolt (42) to move into the engaged position;
• a locking dog (48) that is pivotally secured adjacent the geared end plate (32) and having a distal end that rides within the elongated cut out (44) of the locking bolt (42), the elongated cut out (44) preventing the locking dog (48) from engaging the geared end plate (32) when the locking bolt (42) is in the disengaged position, the elongated cut out (44) forcing the locking dog (48) into engagement with the geared end plate (32) when the locking bolt (42) is in the engaged position, with the locking bolt (42) in engagement with the geared end plate (32) the webbing (24) is prevented from being unwound from the webbing shaft (28);
• whereby when the webbing (24) is unwound from the webbing shaft (28) at a predetermined rate, the locking pawls (58) are moved into the pivoted orientation and engage the locking ring (34), wherein continued displacement of the webbing (24) causes the further rotation of the locking ring (34) which, in turn, causes trigger (38) to engage ramp (36), whereby sear (52) is displaced and spring (50) is permitted to move the locking bolt (42) into the engaged position such that the locking dog (48) engages the geared end plate (32) to prevent further displacement of the webbing (24).